1215713642 has 16 divisors (see below), whose sum is σ = 2142376992. Its totient is φ = 510089520.

The previous prime is 1215713641. The next prime is 1215713657. The reversal of 1215713642 is 2463175121.

It is a junction number, because it is equal to n+sod(n) for n = 1215713599 and 1215713608.

It is not an unprimeable number, because it can be changed into a prime (1215713641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2125088 + ... + 2125659.

It is an arithmetic number, because the mean of its divisors is an integer number (133898562).

Almost surely, 2^1215713642 is an apocalyptic number.

1215713642 is a deficient number, since it is larger than the sum of its proper divisors (926663350).

1215713642 is a wasteful number, since it uses less digits than its factorization.

1215713642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4250773.

The product of its digits is 10080, while the sum is 32.

The square root of 1215713642 is about 34867.0853671482. The cubic root of 1215713642 is about 1067.2768680251.

Adding to 1215713642 its reverse (2463175121), we get a palindrome (3678888763).

The spelling of 1215713642 in words is "one billion, two hundred fifteen million, seven hundred thirteen thousand, six hundred forty-two".